The new engine has approx 3 hrs on it
I have noticed a vibration at wot max rpm. Its not an overly violent vibration but it was not there before the rebuild.

Is this normal

Did you install a lightened flywheel?

No not that I am aware of.
It was rebuilt due to broken fly wheel bolts

did you verify that the flywheel was running true after installing it on the crankshaft? Simple to do while engine is out with a dial indicator near the teeth and spin the motor over. 1 high spot will really cause some problems at 8000+ rpm.